Sigma rule: Decode Base64 Encoded Text -MacOs

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2ee620c14a83, updated 2022-11-26T00:00:00.000Z.

Rule

Title
Decode Base64 Encoded Text -MacOs
Status
test
Level
low
Author
Daniil Yugoslavskiy, oscd.community
Date
2020-10-19
Modified
2022-11-26
File
rules/macos/process_creation/proc_creation_macos_base64_decode.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of base64 utility to decode arbitrary base64-encoded text

Log source

product
macos
category
process_creation

Detection

selection:
    Image: '/usr/bin/base64'
    CommandLine|contains: '-d'
condition: selection

False positives (as the rule lists them)

  • Legitimate activities

Tags

  • attack.stealth
  • attack.t1027

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/macos/process_creation/proc_creation_macos_base64_decode.yml

Sources and licences

  • SigmaHQ

    "Decode Base64 Encoded Text -MacOs" by Daniil Yugoslavskiy, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/macos/process_creation/proc_creation_macos_base64_decode.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Decode Base64 Encoded Text -MacOs",
entity page, dataset version ref-2ee620c14a83, updated 2022-11-26T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/719c22d7-c11a-4f2c-93a6-2cfdd5412f68 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 719c22d7-c11a-4f2c-93a6-2cfdd5412f68, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.